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Since 2008, which of the following issues has been identified by respondents as the "most important problem" facing the country?
Natural Resources
Materials or substances occurring in nature which can be exploited for economic gain, such as minerals, forests, water, and fertile land.
Dust Bowl
A period of severe dust storms in the 1930s that greatly damaged the ecology and agriculture of US and Canadian prairies.
Great Plains
A broad expanse of flat land, covered in prairie, steppe, and grassland, located in the central United States and Canada.
Chlorofluorocarbons (CFCs)
Man-made chemical compounds once used in air conditioning, refrigeration, and aerosol propellants, known to deplete the ozone layer.
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